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   难度：Medium
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   <h1 class="question_title">
    93. Restore IP Addresses
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   <p>
    Given a string containing only digits, restore it by returning all possible valid IP address combinations.
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    <strong>
     Example:
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   <pre>
<strong>Input:</strong> "25525511135"
<strong>Output:</strong> <code>["255.255.11.135", "255.255.111.35"]
</code></pre>
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   <h1 class="question_title">
    93. 复原IP地址
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   <p>
    给定一个只包含数字的字符串，复原它并返回所有可能的 IP 地址格式。
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   <p>
    <strong>
     示例:
    </strong>
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   <pre><strong>输入:</strong> "25525511135"
<strong>输出:</strong> <code>["255.255.11.135", "255.255.111.35"]</code></pre>
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